Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-16-2001, 05:22 PM
atikovi
Guest
 
Posts: n/a
I found two codes on my '94 C280: P0400 EGR Flow Malfunction and P0411 Secondary Air Injection Incorrect Flow. What should I check next?

Reply With Quote
  #2  
Old 04-16-2001, 05:33 PM
engatwork's Avatar
Registered User
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,648
try this to clear the EGR flow

malfunction. You will have to clean out the "pipe" from the egr valve to the intake manifold. This can be as simple as "rodding" out the line from the egr valve to disassembling the connection at the intake end and cleaning it out. Do a search on EGR and you will find this thread.

The other (I would imagine) has to do with your air pump system, maybe the line plugged or the pump inoperable. Wait for someone more knowledgeable in this regard to answer this one.

Jim
'85 300D - no check engine light
'95 E320
'97 CRV
Reply With Quote
  #3  
Old 04-16-2001, 06:06 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The EGR and Sec AIR switchover valves are both on the front of the head and both use the same vacuum source. I would be sure the vacuum line has good vacuum and that the outputs aren't switched. The two systems work at different times.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #4  
Old 04-16-2001, 06:30 PM
JimF's Avatar
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
Check valve

There may be a vacuum check valve in between the AIR and EGR switchover valves. Test it for leaks. Also make sure AIR pump is working when cold.

On my car, the LH-SFI module sends a 'turn-on' signal for each function. Not sure how it's done on your car but probably similar since they're the same year.

Had similar problem but only with AIR. Took all components associated with AIR (switchover valve, check valve, vacuum lines, and EGR switchover valve) apart but could find nothing wrong. After re-assemblying, it worked! No codes since.

[Edited by JimF on 04-16-2001 at 06:40 PM]

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel Trim? OBDII duty cycle, CHECK ENGINE ? ke6dcj Mercedes-Benz Performance Paddock 1 08-07-2001 10:21 PM
Fuel Trim? OBDII cycle and CHECK ENGINE ? ke6dcj Tech Help 1 08-06-2001 08:54 AM



All times are GMT -4. The time now is 11:40 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page